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https://bugs.launchpad.net/bugs/1752165
Title:
TB16 dock freezes X on hotplug when used with external displays
Status in Dell Sputnik:
New
Status in linux package in Ubuntu:
Incomplete
Bug description:
Precision 5520 with Quadro GPU. Latest Ubuntu 16.04, kernel Linux
REDACTED 4.13.0-36-generic #40~16.04.1-Ubuntu SMP Fri Feb 16 23:25:58
UTC 2018 x86_64 x86_64 x86_64 GNU/Linux, latest BIOS 1.7.0 released
12/15/2017. If it can be of any help, I can get this tested on an XPS
9560 (GTX 1050) too.
Steps to reproduce:
1. Plug in monitors into DP and miniDP on the dock. In my case, DP-to-DVI
cables are used, but I doubt that it matters.
2. Ubuntu 16.04 GNOME + nVidia drivers with PRIME.
3. Select nVidia GPU in PRIME settings, reboot if needed.
4. Either boot with the dock connected or connect it after booting into user
session.
5. Set up monitors if necessary. At this point everything should be working
fine.
6. Disconnect the dock, give it a moment to adjust to the new window layout
etc.
7. Re-connect the dock. Within a few seconds laptop screen should freeze and
external monitors should remain blank, as if not connected.
8. Disconnect the dock. Within a few seconds laptop screen should unfreeze.
There is a small chance that it won't if you repeat this procedure multiple
times.
Errors in dmesg indicate that i915 driver is somehow involved:
[ 328.966128] [drm:intel_dp_set_idle_link_train [i915]] *ERROR* Timed out
waiting for DP idle patterns
[ 328.967848] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF B idle bit
[ 329.048839] [drm:intel_dp_set_idle_link_train [i915]] *ERROR* Timed out
waiting for DP idle patterns
[ 329.050547] [drm:intel_wait_ddi_buf_idle [i915]] *ERROR* Timeout waiting
for DDI BUF C idle bit
The kernel logs are flooded with these between steps 7 and 8 above.
This behaviour does not occur when Intel GPU is selected in PRIME
settings or when nouveau is used. However, nouveau performance leaves
a lot to be desired, particularly with 3D acceleration in Windows 10
VMs.
I have tried nvidia_drm.modeset=1 in boot options, but it doesn't make
any difference.
Other reports that may be related:
https://devtalk.nvidia.com/default/topic/989704/linux/plugging-a
-docking-station-w-two-monitors-into-a-quadro-m1000m-laptop-crashes-
hangs-the-whole-machine/ - same error messages
https://www.reddit.com/r/Dell/comments/5nas3t/tb16_dock_with_5510_ubuntulinux/ddzjlu8/?st=je63h7lw&sh=40bf8189
- "Connecting and disconnecting the TB16 sometimes freeze the laptop."
https://www.dell.com/community/Sputnik/TB16-Dock-Linux-
Support/m-p/5109128/highlight/true#M7466 - "Hot-plugging the screen
does not work."
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